(Solved): Determine the gas pressure, in lbf/in. Express the pressure as a gage or a vacuum pressure, as ap ...

Determine the gas pressure, in lbf/in². Express the pressure as a gage or a vacuum pressure, as appropriate, in lbf/in ${}^2$. As shown in the figure, an inclined manometer is used to measure the pressure of the gas within the reservoir. The manometer fluid is mercury, which has a density of $845\mathrm{lb}/{\mathrm{ft}}^3$. The manometer fluid rises a distance $d=15$ inches along the manometer tube, which is inclined $?=40^{?}$ from the horizontal. The atmospheric pressure is $14.7\mathrm{lbf}/{\mathrm{in}}^2$ and the acceleration of gravity is $32.2\mathrm{ft}/{\mathrm{s}}^2$.